Muffler for telephone-transmitters.



PATENTED MAY 29, 1906.

G. A. LONG. MUFFLER FOR TELEPHONE TRANSMITTBRS.

' APPLICATION FILED MAB. 1, 1904.

f/VVENTOR M BY;

fleeting them before UNITED STATES arana .orrrlon;

GEORGE A. LONG, OF HARTFURD, counnorrcn'r.

MUFFLER FOR TELEPHONEI-TRANSY'M-ITTERS To all whom it may cohcern:

Be it known that, I GEORGE A, Lone, a citizen of the United States, anda resident of Hartford, in the county of Hartford and State ofConnecticut, have invented a oer-- sion of sound to atelephone-transmitter andmay be used upon any ordinary telephone inpresent use, or'a special -transmitter may be used embodying theinvention, which is then contained within the casing which holds thetransmitter parts, including the diaphragm.

The object of the invention is to provide a device which isnormally inposition to permit transmission of sounds to the telephonetransmitter,but which may by mani ulation effectually out off sound-waves an preventtheir action upon the diaphragm, which ordinarily gives the necessaryvibration for transmitting the sounds A further object of the inventionis to provide an absolute mufiie for the diaphragm of thetelephone-transmitter, thereby holding the diaphragm; to-preventvibration or by shutting out the sound-waves, and thus dethey reach thediaphra to vibrate it. i v A still further object is to provide aselfcontained device which may be applied to the transmitter of atelephone, such as is in common use. i

Referring to thedrawings, Figure 1 is a perspective view of the deviceapplied to an ordinary telephone-transmitter. Fig. 2 is a front faceview of thetransmitter with the Fig. 3 is a'view in side elevation ofthe muffler. Fig. 4 is a rear face viewof the front plate; *Fig. 5 is asectional view through the parts shown in Fig. 4.

muflier removed.

:Fig. 6 is a perspective view of the muffler,

plate.

' In the use of an ordinary telephone-transmitter when the receiver isremoved from the hookand held to the ear sounds or soundwaves, whichthen reach the transmitter, create a vibration of the diaphragm of thetrans mitter, and these sounds are conducted to the receiver held-to theear of the operator. In

using an instrument, for instance, with the windows open and where thereis a confusion of noises from street traffic or other sources thevibration upon the transmitter-dia- Specificationof Letters Patent. YApplication filed March 1,1904. Serial No. 196,067.

fatented may 29,1906.

phragm' is often such as to confuse the vibra tions caused by the voiceof the user, and oftentimes great'difliculty is experienced in clearlyhearing a conversation over the instrument. It is well known that it hasbeen common practice to. place the palm of the hand over the transmitterwhile listening to the message transmitted from-thekother end of theline; but, so far as is known, no device has been provided which couldbe operated with facility foreifectually shutting extraneous sounds atany desired moment.

A further object in providing suchfa device results in the use of aninstrument for ordinary business. A person using aniinstrument oftendesires to ask for information which is not intended to be transmittedover the wire, and the devicehereinafter described may be" readily usedto cut on the transmit-' ter at an instants notice, and thus'p'recludefthe possibility or the transmission of infor mation or soundsnot'int'ended for the; party called on the telephone.- l

'-In the accompanyingdrawi'ngsthe nu-"8o meral 1 denotes an ordinarytelephone-trans mitter, and 2a mufflercase secured thereto. Thismuffler-case comprises two sections, an' outer casing 3, having ascrew-threaded tubular member 4,- and an inner sectionfiy'whi'ch' 8 5forms a direct support for the movable parts of the muffler. The tubularscrew threaded' member 4 is of such a size and form as tobe' inserted inthe mouthpiece-opening 6 into which opening the mouthpiece of the transomitter is ordinarily screwed.-

The inner or supporting section5 of'the muffler-case has anangularly-formedgroove 7, extending about its periphery, one wall of"which slopes rearward and outward from thebottom of the, groove. Theouter casing 3 has screws 9 passing through it, and these screwsengaging the beveled surface 8.:draw the parts normally together andinsurelthe back face of the section 5 being brought into 10.0 closecontact with the bottom of .the cup-like outercasing3. .1

The ordinary, mouthpiece 10 is screwedinto the front face of section 5in the same. manner in which itis ordinarily secured'in 10 the openingofthe ordinary transmitter.

The inner orsuppo'rting section 5 of the casing is provided with aslideway '11 upon its rear face, and on each side of this slideway arerecesses 12, ranged springs 13. A shutter or deflector 14, having anoutwardly-extending handle 15, is

within which are ar-

